Re: [gpsd-users] ✘Galileo TITSUP

[Mike Tubby]

On 16/07/2019 02:25, Gary E. Miller wrote:
> Yo All!
>
> <snip>
>
> gpsd has never reported the health flag for GNSS sats.  That is now
> changed in git head.  If the health is known then SKY JSON now returns:
>
>         Healthy:  "health":1
>         Sick:  "health":2
>
> satellite_t health is an unsigned char with zero is the Unknown value.
>
> If your GPS receiver follows Galileo you can see that PRN 305 is
> currently reporting unhealthy.  You can see this with cgps by a 'u'
> next to the used Y flag.
>
> RGDS
> GARY

Gary,

The way that Trimble do 'health of GPS receiver' is interesting and may 
be relevant as there is only one 'good' state and multiple 'not good' 
states:

Current status of receiver:
    0    Doing position fixes
    1    Do not have GPS time yet
    2    (Reserved)
    3    PDOP is too high
    8    No usable satellites
    9    Only 1 usable satellite
    10    Only 2 usable satellites
    11    Only 3 usable satellites
    12    The chosen satellite is unusable - when in 1D (single 
satellite) mode


In addition to the core 'receiver health' many receivers now are able to 
monitor the antenna for open/short circuit and some receivers also 
detect and report jamming and/or spoofing.

If we're making changes to git head would you consider:

    typedef  struct {
        unsigned char health;
        unsigned char antenna;
        unsigned char spoofing;
        unsigned char jamming;
    } gps_health_t;

where:

    health:        is receiver health is a enumerated value indicating 
the state of the receiver, for example:
                            0: Doing position fixes
                            non-zero values for other states

    antenna:    is the health of the antenna, for example:
                            0: No fault detected or antenna not monitored
                            1: Short circuit detected
                            2: Open circuit detected

    spoofing:    is the state of the spoof detection:
                            0: No spoofing detected or spoof detection 
not supported
                            1: Spoofing detected

    jamming:    is the state of the jamming detection:
                            0: No jamming detected or jamming detection 
not supported
                            1: Jamming detected

this would regularise everything to be zero for no problem or no fault 
and non-zero for a problem/fault


Mike